Bioactive glasses were made by the melt-quench technique with compositions selected from the system Na2O-CaO-SiO2-P2O5 such that the glasses would undergo spinodal decomposition. Some of the glasses were heat treated to produce crystalline glass-ceramics. The glasses and glass-ceramics were then chemically treated to leach out one or more phases produced by the spinodal decomposition, leaving behind a porous scaffold. This scaffold contains bimodal porosity on both the nano and macro scale. The effects of the heat and chemical treatments onto he structure of the glasses and glass-ceramics were investigated using optical microscopy, X-ray diffraction, scanning electron microscopy and mercury porosimetry. Results showed that many of the samples had numerous cracks.
